Nessuno vuole uccidere.

Because nessuno is grammatically singular in Italian. It behaves like no one in English, not like people.

So Italian uses:

• Nessuno vuole... = No one wants...

Not:

• Nessuno vogliono... ❌

Even though it refers to zero people, the grammar is singular.

Here, nessuno is an indefinite pronoun. It stands on its own and means nobody / no one.

In this sentence:

• Nessuno = the subject
• vuole = the verb
• uccidere = the infinitive verb

So the structure is basically:

• No one + wants + to kill

Because volere is followed by another verb in the infinitive.

This is the same pattern as in English:

• want to eat
• want to go
• want to kill

In Italian:

• vuole mangiare
• vuole andare
• vuole uccidere

So vuole uccidere literally works like wants to kill.

In Italian, after volere, you normally use the infinitive directly, without a separate word for to.

So:

• vuole uccidere = wants to kill
• vuole parlare = wants to speak
• vuole partire = wants to leave

English needs to, but Italian does not in this structure.

Yes. Nessuno can be:

• a pronoun: Nessuno vuole uccidere. = No one wants to kill.
• an adjective before a noun: nessuna persona = no person, nessun motivo = no reason

Examples:

• Nessuno parla. = No one is speaking.
• Nessuna persona parla. = No person is speaking.

So in your sentence, it is a pronoun because no noun follows it.

Because nessuno is the subject, and when nessuno comes before the verb as the subject, non is not needed.

So:

• Nessuno vuole uccidere. ✅

But when nessuno comes after the verb, Italian usually uses non:

• Non vuole uccidere nessuno. = He/She doesn’t want to kill anyone or doesn’t want to kill anybody

This is an important difference:

• Nessuno vuole uccidere. = no one wants to kill
• Non vuole uccidere nessuno. = he/she does not want to kill anyone

They are not the same sentence.

Yes. In most cases, nessuno can be translated as either nobody or no one.

For example:

• Nessuno capisce. = Nobody understands / No one understands

The difference is mainly stylistic in English, not grammatical in Italian.

Yes. It is grammatically complete.

Uccidere is a transitive verb, so it often has an object:

• uccidere il re = to kill the king
• uccidere qualcuno = to kill someone

But the object can be left unstated if the idea is general:

• Nessuno vuole uccidere. = No one wants to kill.

This sounds broad and general, as if the sentence is talking about the act itself rather than a specific victim.

No, not in this sentence.

Use nessuno when it stands alone as a pronoun:

• Nessuno vuole uccidere. ✅

Use nessun before certain masculine singular nouns:

• nessun uomo
• nessun motivo

And use nessuna before feminine singular nouns:

• nessuna persona
• nessuna idea

So:

• nessuno = pronoun here
• nessun = adjective before a masculine noun
• nessuna = adjective before a feminine noun

Yes. Vuole is the third person singular form of volere in the present tense.

Present tense of volere:

• io voglio
• tu vuoi
• lui/lei vuole
• noi vogliamo
• voi volete
• loro vogliono

Since nessuno is singular, you use vuole.

The normal word order is:

• Nessuno = subject
• vuole = verb
• uccidere = infinitive

So:

• Nessuno vuole uccidere.

This is the most natural and neutral order in Italian.

Italian word order can sometimes change for emphasis, but this basic order is the standard one learners should use first.